Your mix sounds good but you will still need to adjust your pH by adding 20 to 25% lime. If you have a problem with it having poor structure (getting too smooth when moist) then reduce the lime to 15 to 20% and add 15% oyster shell. But with 50% vermiculite you probably want have that problem...mine never did...I stay away from oyster shell myself.

I stopped using manure based casings because of the higher rate of contams compared to the standard non manure mixes. Good Luck.

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Peace, Love & Light

Above 5.5 add a heaped tea spoon for every pan

If lower add a heaped sou[p spoon...

blah

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Peace
Blue